Well id would top it up with oil and keep a very close eye on it as it could engine or turbo related or just a never serviced correctly and filled to begin with

the exhaust isnt standard and nothing like ive seen before it looks like a cheap knock up

regards the esp fault you will need sort the drop links out the shocker and front arms as the wheel sensors and level sensors are a bit narky on the st or new sensors as thats what the code is